SOCS 3 and PPAR-gamma ligands inhibit the expression of IL-6 and TGF-beta1 by regulating JAK2/STAT3 signaling in pancreas.

Abstract

Induction of proinflammatory cytokines IL-6 and TGF-beta1 are the hallmark of human pancreatitis. Cerulein pancreatitis is similar to human edematous pancreatitis involving dysregulation of digestive enzyme production, cytoplasmic vacuolization, and increased cytokine production. We previously showed that cerulein induced IL-1beta expression through the Janus kinase (JAK) 2/signal transducer and activator of transcription (STAT) 3 pathway in pancreatic acinar cells. Suppressor of cytokine signaling (SOCS) is a negative feedback regulator of JAK/STAT signaling. In this study, we demonstrate that SOCS 3 is induced by cerulein in pancreatic acinar AR42J cells and in the rat pancreas. In both AR42J cells and rat pancreas, cerulein induced expression of IL-6 and TGF-beta1, which is enhanced by transfection or injection of SOCS 3 antisense oligonucleotide (AS ODN). Pre-treating cerulein-stimulated AR42J cells or rats with the peroxisome proliferator activated receptor-gamma (PPAR-gamma) ligands, 15d-PGJ2 and troglitazone, induced SOCS 3 expression and inhibited JAK2/STAT3 activation. This treatment regimen also inhibited IL-6 and TGF-beta1 induction, vacuolization, and alpha-smooth muscle actin (alpha-SMA) expression. Thus, SOCS 3 expression is associated with a reduction in IL-6 and TGF-beta1 expression, edema formation, vacuolization, and alpha-SMA expression, possibly by direct regulation of JAK2/STAT3 signaling. 15d-PGJ2 and troglitazone are potentially useful pancreatitis therapies by suppressing the JAK2/STAT3 inflammatory signaling through SOCS 3 induction.

• Authors: Ji Hoon Yu, Kyung Hwan Kim, Hyeyoung Kim
• Journal: The international journal of biochemistry & cell biology (Int J Biochem Cell Biol) Vol. 40 Issue 4 Pg. 677-88 ( 2008) ISSN: 1357-2725 [Print] Netherlands
• PMID: 18035585 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• 15-deoxyprostaglandin J2
• Chromans
• Interleukin-6
• PPAR gamma
• STAT3 Transcription Factor
• Socs3 protein, rat
• Stat3 protein, rat
• Suppressor of Cytokine Signaling 3 Protein
• Suppressor of Cytokine Signaling Proteins
• Thiazolidinediones
• Transforming Growth Factor beta1
• Ceruletide
• Jak2 protein, rat
• Janus Kinase 2
• Troglitazone
• Prostaglandin D2

Topics

• Animals
• Blotting, Western
• Cell Line, Tumor
• Ceruletide (pharmacology)
• Chromans (pharmacology)
• Enzyme-Linked Immunosorbent Assay
• Interleukin-6 (genetics, metabolism)
• Janus Kinase 2 (metabolism)
• Male
• PPAR gamma (metabolism)
• Pancreas (drug effects, metabolism)
• Prostaglandin D2 (analogs & derivatives, pharmacology)
• Rats
• Rats, Sprague-Dawley
• Reverse Transcriptase Polymerase Chain Reaction
• STAT3 Transcription Factor (metabolism)
• Signal Transduction (drug effects, physiology)
• Suppressor of Cytokine Signaling 3 Protein
• Suppressor of Cytokine Signaling Proteins (genetics, metabolism)
• Thiazolidinediones (pharmacology)
• Transforming Growth Factor beta1 (genetics, metabolism)
• Troglitazone